7) A) Why are long ligaments less rate dependent than short ligaments? (5 points

Question

7) A) Why are long ligaments less rate dependent than short ligaments? (5 points) B) In an un-cemented femoral implant (section of a total hip replacement), the long stem has no function once the bone grows into the implant. So, why is it used (considering that it may be the cause of infection leading to implant failure)? (5 points) 8) A) Explain how mechanical strength, melting temperature, and thermal expansion are related at the atomic level. Specifically, how do they relate to each other and the bonding energy between the atoms? (6 points) B) A vector passes through a cube from a position (1, 0, 3/4) to a position (1/4. 1. 1/4). What are its direction indices? (4 points)

Explanation / Answer

7. A. Ligaments generally do not move or twitch on its own. It is dependent in bones and muscles that are attached to it. The rate of dependency of ligaments are due to viscoelastic component.

B. Long stem hip arthroplasty appears to be associated with higher incidence of BCIS( bone cement implantation syndrome). Once the bone has grown into implant, the long stem has no function due to intraoperative mortality.

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